Transition Reference Temperature for 20MnMoNi55 RPV Steel at Different Loading Rates

Paul, Subir; Acharyya, S. K.; Sahoo, Prasanta; Chattopadhyay, J.

doi:10.1007/978-3-319-96968-8_6

Cited by 2 publications

(3 citation statements)

References 12 publications

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“…There are two tolerance limits (Upper bound is 95% and lower bound is 5%) in the master curve which signifies the validity of the data. The tolerance limits are calculated using equation (6).…”

Section: Macro Analysis Of Embrittlement -Master Curve and Reference ...mentioning

confidence: 99%

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Study of Weibull parameters at different loading rates for 20MnMoNi55 steel using Beremin model

Paul

Bhattacharjee

Acharyya

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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This work considers the influence of loading rate on the Weibull stress parameters in the Beremin model for 20MnMoNi55 RPV steel using finite element modelling of compact tension specimen. For failure analysis of cleavage fracture at component level, the Beremin model is very useful. To implement the Beremin model, the model parameters needed to be calibrated for this particular material with experimental observation. In the first portion of this study, some fracture experiments are conducted at -100°C for four different loading rates ranging from quasi-static to dynamic rates (0.625 MPa√m/s – 255.8 MPa√m/s) to obtain master curves and reference temperatures. Then calibration of the Weibull stress parameters is done in a specific loading rate by linear regression analysis for different a/W ratios. For the other loading rates, Monte Carlo simulation technique along with respective master curve is used to calibrate the model parameters. Then variation of the Weibull stress parameters with loading rate is studied. This study shows that loading rate has a significant effect on the Weibull stress parameters. Reference temperatures are also determined for different a/W ratios and loading rate by calibrated Weibull stress parameters from experiments as well as Monte-Carlo simulation. Obtained reference temperatures are compared with experimental values for respective loading rates. With the increasing loading rate reference temperature, obtained from the Beremin model is found to be increased and it matches well with the experimental reference temperature values.

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Section: Macro Analysis Of Embrittlement -Master Curve and Reference ...mentioning

confidence: 99%

“…In the previous study it is observed that experimental T 0 is highly dependent on loading rates. T 0 increases with the increase of loading rate [6]. Now that experimental observation is to be validated from local approach model also.…”

Section: Introductionmentioning

confidence: 99%

Study of Weibull parameters at different loading rates for 20MnMoNi55 steel using Beremin model

Paul

Bhattacharjee

Acharyya

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Wallin’s prediction has already been verified for 20MnMoNi55 steel in the dynamic loading range and for 1T C(T) (1 inch thick) specimens. 13 In the present study, T 0 is obtained from fracture tests on both 1T C(T) and TPB specimens for different loading rates and the correlation is studied.…”

Section: Introductionmentioning

confidence: 99%

Finite element simulation of fracture toughness testing of 20MnMoNi55 steel and the effect of loading rate on reference temperature

Paul

Bhattacharjee

Acharyya

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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Fracture toughness of ferritic steel in the ductile-to-brittle transition zone is scattered and probabilistic owing to embrittlement. Use of master curve along with the reference temperature ( T0) adopted in ASTM E-1921 is widely accepted for characterization of this embrittlement. Reference temperature is a measure of embrittlement in the temperature scale. Factors affecting fracture toughness like geometry and loading rate are expected to influence the reference temperature. In the present study, the role of the loading rate on the reference temperature for 20MnMoNi55 steel is assessed experimentally using compact tension C(T) and three-point bend (TPB) specimens. Finite element simulation of tests at different loading rates and cryogenic temperature are carried out using a suitable viscoplastic material model that incorporates flow characteristics of the material for varying displacement rates and cryogenic temperatures. Results from simulation studies are compared with experimental ones.

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Transition Reference Temperature for 20MnMoNi55 RPV Steel at Different Loading Rates

Cited by 2 publications

References 12 publications

Study of Weibull parameters at different loading rates for 20MnMoNi55 steel using Beremin model

Study of Weibull parameters at different loading rates for 20MnMoNi55 steel using Beremin model

Finite element simulation of fracture toughness testing of 20MnMoNi55 steel and the effect of loading rate on reference temperature

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